Charging circuit, charging device and charging system of lithium battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a charging circuit, a charging device and a charging system of a lithium battery. The charging circuit comprises a power supply module, a discharging load, a power supply control module, a discharging control module and a controller, the power supply module, the lithium battery and the power supply control module are sequentially connected in series to form a power supply loop, the discharging load, the lithium battery and the discharging control module are sequentially connected in series to form a discharging loop, and the controller is in communication connection with the lithium battery. The controller controls the power supply control module to conduct the power supply loop to charge the lithium battery after receiving a charging signal of the lithium battery, and controls the power supply control module and the discharging control module to be alternately opened and closed after receiving a heating signal of the lithium battery to output a pulse signal to the lithium battery to enable the temperature of the lithium battery to rise. By controlling the power supply control module and the discharge control module, efficient heating and charging functions are realized, and the charging reliability of the lithium battery is greatly ensured.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to a charging circuit, charging device and charging system for a lithium battery. Background Technology

[0002] Lithium-ion batteries are widely used in many fields due to their high energy density and long cycle life, especially in the two-wheeled electric vehicle market. However, when the ambient temperature decreases, the performance of lithium-ion batteries is significantly affected: the viscosity of the electrolyte increases and the ionic conductivity decreases, which directly leads to a significant reduction in the battery's charge and discharge efficiency.

[0003] To address this issue, existing technologies often employ heating elements placed at the top or bottom of the battery. This method utilizes the characteristic that the resistance of the heating element increases with temperature, achieving adaptive temperature control. However, this approach can lead to uneven heat distribution, thereby affecting the overall performance and efficiency of the battery. Utility Model Content

[0004] In view of this, the present application provides a charging circuit, charging device and charging system for a lithium battery, which can effectively solve the problem in the prior art of using heating elements to heat the battery, resulting in uneven heat distribution, which in turn affects the overall performance and efficiency of the battery.

[0005] In a first aspect, embodiments of this application provide a charging circuit for a lithium battery, comprising: a power supply module, a discharge load, a power supply control module, a discharge control module, and a controller;

[0006] The power supply module, the lithium battery, and the power supply control module are connected in series to form a power supply circuit, and the discharge load, the lithium battery, and the discharge control module are connected in series to form a discharge circuit.

[0007] The controller is communicatively connected to the lithium battery. When the controller receives a charging signal from the lithium battery, it controls the power supply control module to turn on the power supply circuit to charge the lithium battery. When the controller receives a heating signal from the lithium battery, it controls the power supply control module and the discharge control module to alternately turn on and off to output a pulse signal to the lithium battery, thereby raising the temperature of the lithium battery.

[0008] In some embodiments, the power supply control module includes: a first control unit and a second control unit, wherein the input terminal of the first control unit is connected to the output terminal of the power supply module, the output terminal of the first control unit is connected to the control terminal of the second control unit, the control terminal of the first control unit is electrically connected to the controller, the input terminal of the second control unit is connected to the negative terminal of the lithium battery, and the output terminal of the second control unit is connected to the negative terminal of the power supply module.

[0009] In some embodiments, the power supply control module further includes: a first discharge unit, wherein the input terminal of the first discharge unit is connected to the control terminal of the second control unit, the output terminal of the first discharge unit is connected to the negative terminal of the power supply module, and the control terminal of the first discharge unit is connected to the output terminal of the first control unit.

[0010] In some embodiments, the discharge control module includes a third control unit and a fourth control unit. The input terminal of the third control unit is connected to the output terminal of the power supply module. The first output terminal of the third control unit is connected to the control terminal of the fourth control unit. The control terminal of the third control unit is electrically connected to the controller. The input terminal of the fourth control unit is connected to the negative terminal of the lithium battery. The output terminal of the fourth control unit is connected to the negative terminal of the discharge load.

[0011] In some embodiments, the discharge control module further includes: a second discharge unit, wherein the input terminal of the second discharge unit is connected to the control terminal of the fourth control unit, the output terminal of the second discharge unit is connected to the negative terminal of the lithium battery, and the control terminal of the second discharge unit is connected to the second output terminal of the third control unit.

[0012] In some embodiments, the second control unit includes four switching transistors connected in parallel.

[0013] In some embodiments, the power supply module includes a DC-DC converter and a voltage regulator. The input terminal of the DC-DC converter is connected to the positive terminal of the lithium battery. The input terminal of the DC-DC converter is used to input a first power signal, and the output terminal of the DC-DC converter is used to output a second power signal. The input terminal of the voltage regulator is used to input the second power signal, and the voltage regulator is used to regulate the voltage of the second power signal.

[0014] Secondly, embodiments of this application provide a lithium battery charging device, which includes at least one lithium battery charging circuit as described in the first aspect above.

[0015] Thirdly, embodiments of this application provide a charging system, the charging system including a lithium battery and a charging device for at least one lithium battery as described in the second aspect above.

[0016] In some embodiments, the charging device is a two-wheeled vehicle charger, and the lithium battery is a two-wheeled vehicle lithium battery.

[0017] The embodiments of this application have the following beneficial effects:

[0018] The lithium battery charging circuit of this application includes: a power supply module, a discharge load, a power supply control module, a discharge control module, and a controller. The power supply module, lithium battery, and power supply control module are connected in series to form a power supply circuit, and the discharge load, lithium battery, and discharge control module are connected in series to form a discharge circuit. The controller is communicatively connected to the lithium battery. When the controller receives a charging signal from the lithium battery, it controls the power supply control module to activate the power supply circuit to charge the lithium battery. When it receives a heating signal from the lithium battery, it controls the power supply control module and the discharge control module to alternately open and close, outputting pulse signals to the lithium battery to raise its temperature. This application achieves efficient heating and charging functions for the lithium battery without any structural or component-level modifications by controlling the power supply control module and the discharge control module, greatly ensuring the reliability of lithium battery charging. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram illustrating the application of a lithium battery charging device according to an embodiment of this application is shown.

[0021] Figure 2 A first structural schematic diagram of the charging circuit of a lithium battery according to an embodiment of this application is shown;

[0022] Figure 3 A schematic diagram of the waveform of the pulse signal according to an embodiment of this application is shown;

[0023] Figure 4 A schematic diagram of the power supply control module according to an embodiment of this application is shown;

[0024] Figure 5 A circuit diagram of the power supply control module according to an embodiment of this application is shown;

[0025] Figure 6 A schematic diagram of the discharge control module according to an embodiment of this application is shown;

[0026] Figure 7 A circuit diagram of the discharge control module according to an embodiment of this application is shown;

[0027] Figure 8 A circuit diagram of the power supply module according to an embodiment of this application is shown.

[0028] Explanation of key component symbols:

[0029] 10: Lithium battery; 20: Charging plug; 30: Charging device; 31: Power supply module; 32: Discharge load; 33: Power supply control module; 34: Discharge control module; 35: Controller; 331: First control unit; 332: Second control unit; 333: First discharge unit; 341: Third control unit; 342: Fourth control unit; 343: Second discharge unit. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0031] The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0032] In the following text, the terms "comprising," "having," and their cognates, which may be used in various embodiments of this application, are intended only to indicate a particular feature, number, step, operation, element, component, or combination thereof, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, or adding the possibility of one or more combinations thereof. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0033] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. Terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as in their contextual meaning in the relevant technical field and shall not be construed as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0034] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] Considering the problems of uneven heat distribution caused by the use of heating elements to heat batteries in existing technologies, which affects the overall performance and efficiency of the battery, this application proposes a charging circuit, charging device, and charging system for a lithium battery. By controlling the power supply control module and the discharge control module, this application achieves efficient heating and charging functions for the lithium battery without any structural or component-level modifications, greatly ensuring the reliability of lithium battery charging.

[0036] The charging circuit of this lithium battery will be described below with reference to some specific embodiments.

[0037] Figure 1 This illustration shows an application diagram of a lithium battery charging device 30 according to an embodiment of this application. The lithium battery charging device 30 is provided with a lithium battery charging circuit. It is understood that the charging device 30 is a charger. Exemplarily, the lithium battery is a two-wheeled vehicle lithium battery, and the charging device 30 is a two-wheeled vehicle charger. An external power source is connected via a charging plug 20, and the two-wheeled vehicle charger and the two-wheeled vehicle lithium battery can form a charging system.

[0038] Figure 2 A schematic diagram of a lithium battery charging circuit according to an embodiment of this application is shown. Exemplarily, the lithium battery charging circuit includes: a power supply module 31, a discharge load 32, a power supply control module 33, a discharge control module 34, and a controller 35. The power supply module 31, the lithium battery 10, and the power supply control module 33 are connected in series to form a power supply loop. Specifically, the positive terminal of the power supply module 31 is connected to the positive terminal of the lithium battery 10, the negative terminal of the lithium battery 10 is connected to the input terminal of the power supply control module 33, and the output terminal of the power supply control module 33 is connected to the negative terminal of the power supply module 31. It is understood that the positive terminal of the power supply module 31 is connected to an external power source, using the signal from the external power source to supply power to the lithium battery 10. Furthermore, the power supply module 31 is also used to provide power signals to the various modules and the controller 35 in the charging device 30. In this context, the positive terminal of lithium battery 10 is represented by P+, the positive terminal of lithium battery 10 is represented by P-, the positive terminal of power supply module 31 is represented by DC+, the negative terminal of power supply module 31 is represented by DC-, the positive terminal of discharge load 32 is represented by LOAD+, and the negative terminal of discharge load 32 is represented by LOAD-.

[0039] Understandably, controller 35 can be any type of controller, such as an MCU, FPGA, CPU, or DSP. Any type of control element can be configured in the power supply control module 33. It can include a switching transistor, and controller 35 controls the power supply circuit's on / off state by controlling the switching transistor. It can also include an optocoupler, and controller 35 controls the power supply circuit's on / off state by controlling the optocoupler. Furthermore, it can include a relay, and controller 35 controls the power supply circuit's on / off state by controlling the relay. Moreover, multiple control elements can be configured in the power supply control module 33, and these elements can be combined to control the power supply circuit's on / off state.

[0040] The discharge load 32, lithium battery 10, and discharge control module 34 are connected in series to form a discharge circuit. Specifically, the positive terminal of lithium battery 10 is connected to the positive terminal of discharge load 32, the negative terminal of discharge load 32 is connected to the input terminal of discharge control module 34, and the output terminal of discharge control module 34 is connected to the negative terminal of lithium battery 10. The structure of discharge control module 34 can be the same as that of power supply control module 33, or it can be different from the structure of power supply control module 33.

[0041] The controller 35 is connected to the battery management unit in the lithium battery 10 via wired or wireless communication. Furthermore, the controller 35 and the battery management unit can be connected through various communication methods. The battery management unit can detect the temperature of the cells in the lithium battery 10 and the state of health (SOH) of the lithium battery 10. The temperature threshold can be set according to the actual application. For example, when the temperature is lower than a first temperature, the battery management unit determines that the cell needs to be heated and outputs a heating signal; when the temperature is higher than a second temperature, the battery management unit determines that the cell does not need to be heated and outputs a stop heating signal; when the cell charge is lower than a first charge, the battery management unit determines that the cell needs to be charged and outputs a charging signal and voltage and current values ​​to the controller 35; when the cell charge is higher than a second charge, the battery management unit determines that the cell is fully charged and outputs a stop charging signal to the controller 35.

[0042] The operation of the lithium battery charging circuit in this embodiment is as follows: Upon receiving a heating signal from the lithium battery 10, the controller 35 sets the parameters of the heating pulse signal according to the current temperature and current SOH of the lithium battery 10, and controls the power supply control module 33 and the discharge control module 34 to alternately open and close according to the pulse signal, so that the pulse signal flows to the lithium battery 10 to heat the lithium battery 10 and raise its temperature. Exemplarily, the pulse signal is as follows: Figure 3As shown, the peak value of the pulse signal is the optimal current value set by the controller 35 based on the current temperature and current SOH of the lithium battery 10, and the pulse width of the pulse signal is the optimal charging time and optimal discharging time set by the controller 35 based on the current temperature and current SOH of the lithium battery 10.

[0043] When a stop heating signal is received from the lithium battery 10, the power supply control module 33 and the discharge control module 34 are controlled to stop outputting pulse signals; when a charging signal is received from the lithium battery 10, the lithium battery 10 is continuously charged according to the voltage and current values ​​sent by the lithium battery 10.

[0044] When the heating signal from the lithium battery 10 is received again, the parameters of the heating pulse signal are set according to the current temperature and current SOH of the lithium battery 10. The power supply control module 33 and the discharge control module 34 are alternately turned on and off according to the pulse signal, so that the pulse signal flows to the lithium battery 10 to heat the lithium battery 10 and raise its temperature. This process is repeated until the cell is fully charged, and the controller 35 receives a stop charging signal.

[0045] The lithium battery charging circuit of this embodiment includes a power supply module 31, a discharge load 32, a power supply control module 33, a discharge control module 34, and a controller 35. The power supply module 31 supplies power to the lithium battery 10 using an external power source signal, and the discharge load 32 discharges the lithium battery 10. By controlling the power supply control module 33 and the discharge control module 34, the lithium battery 10 is heated and charged. The heating and charging functions are integrated into the charger without significant modifications to the battery pack or relying on external components, which greatly improves the charging performance of the lithium battery in low-temperature environments.

[0046] As an alternative solution, Figure 4 The diagram shown is a structural schematic of the power supply control module 33. Accordingly, Figure 5 As shown Figure 4 A circuit diagram of the power supply control module 33.

[0047] In one embodiment, based on the above embodiments, such as Figure 4 and Figure 5As shown, the power supply control module 33 includes: a first control unit 331 and a second control unit 332. The input terminal of the first control unit 331 is connected to the output terminal of the power supply module 31, and the output terminal of the first control unit 331 is connected to the control terminal of the second control unit 332. The control terminal of the first control unit 331 is electrically connected to the controller 35. The input terminal of the second control unit 332 is connected to the negative terminal of the lithium battery 10, and the output terminal of the second control unit 332 is connected to the negative terminal of the power supply module 31. The structures of the first control unit 331 and the second control unit 332 can be the same or different.

[0048] Exemplarily, the first control unit 331 includes switching transistors Q2 and Q1. By using two switching transistors, the driving capability of the controller 35 can be enhanced. The second control unit 332 includes four switching transistors Q3, Q5, Q6, and Q8 connected in parallel. By setting four switching transistors in parallel, the maximum current carrying capacity of the circuit can be significantly improved. Each switching transistor shares a portion of the total current, allowing the entire circuit to safely handle larger currents. Furthermore, by dissipating current, heat accumulation on individual components is reduced, thermal stress is lowered, component life is extended, the risk of failure is reduced, and the reliability of the circuit is greatly improved.

[0049] Furthermore, to accelerate the turn-off of the various switches in the second control unit 332, the power supply control module 33 further includes a first discharge unit 333. The input terminal of the first discharge unit 333 is connected to the control terminal of the second control unit 332, the output terminal of the first discharge unit 333 is connected to the negative terminal of the power supply module 31, and the control terminal of the first discharge unit 333 is connected to the output terminal of the first control unit 331. Exemplarily, the first discharge unit 333 includes switches Q4 and Q7. When the second control unit 332 needs to be turned off, switch Q1 is turned off, controlling switch Q7 to conduct, pulling the control terminal signal of switch Q4 low, and turning on switch Q4. This allows the signals at the control terminals of the various switches in the second control unit 332 to be released more quickly, thereby accelerating the turn-off of the second control unit 332.

[0050] The power supply process of the power supply control module 33 in this embodiment is as follows: When it is necessary to control the power supply circuit to be turned on, the controller 35 outputs a high-level signal to control the switch Q2 to be turned on, pulls down the signal at the control terminal of the switch Q1, turns on the switch Q1, provides a high-level signal to the control terminals of each switch of the second control unit 332, turns on each switch of the second control unit 332, and turns on the power supply circuit.

[0051] When it is necessary to control the power supply circuit to be turned off, the controller 35 outputs a low-level signal to control the switch Q2 to turn off, causing the switch Q1 to turn off, while the switches Q7 and Q4 are turned on, pulling down the control terminal signal of the second control unit 332, accelerating the turn-off of the second control unit 332. After the second control unit 332 is turned off, the power supply circuit is turned off.

[0052] In this embodiment, the lithium battery charging circuit enhances the driving capability of the controller 35 by cascading switches Q2 and Q1. The parallel connection of four switches increases the circuit's maximum current carrying capacity, reduces thermal stress on various components, and improves circuit reliability. The cascading switches Q4 and Q7 accelerate the turn-off of the second control unit 332, further ensuring circuit reliability.

[0053] As an alternative solution, Figure 6 The diagram shown is a structural schematic of the discharge control module 34. Accordingly, Figure 7 As shown Figure 6 A circuit diagram of the discharge control module 34.

[0054] In one embodiment, based on the above embodiments, such as Figure 6 and Figure 7 As shown, the discharge control module 34 includes a third control unit 341 and a fourth control unit 342. The input terminal of the third control unit 341 is connected to the output terminal of the power supply module 31. The first output terminal of the third control unit 341 is connected to the control terminal of the fourth control unit 342. The control terminal of the third control unit 341 is electrically connected to the controller 35. The input terminal of the fourth control unit 342 is connected to the negative terminal of the lithium battery 10, and the output terminal of the fourth control unit 342 is connected to the negative terminal of the discharge load 32. It is understood that the third control unit 341 and the first control unit 331 may have the same structure, or they may have different structures. Similarly, the fourth control unit 342 and the second control unit 332 may have the same structure, or they may have different structures.

[0055] As an example, the structure of the fourth control unit 342 is the same as that of the second control unit 332. The fourth control unit 342 includes four parallel switches Q10, Q12, Q14 and Q15. By setting multiple switches in parallel, the current carrying capacity of the circuit is improved.

[0056] The third control unit 341 includes switching transistors Q9 and Q11. Furthermore, to accelerate the turn-off of the switching transistors in the fourth control unit 342, the discharge control module 34 also includes a second discharge unit 343. The input terminal of the second discharge unit 343 is connected to the control terminal of the fourth control unit 342, the output terminal of the second discharge unit 343 is connected to the negative terminal of the lithium battery 10, and the control terminal of the second discharge unit 343 is connected to the second output terminal of the third control unit 341. Exemplarily, the second discharge unit 343 is switching transistor Q13.

[0057] The discharge process of the discharge control module 34 in this embodiment is as follows: when the discharge circuit needs to be turned on, the controller 35 outputs a low-level signal to control the switch Q11 to turn off and the switch Q9 to turn on, providing a high-level signal to the control terminals of each switch of the fourth control unit 342, and the switches of the fourth control unit 342 are turned on, thus turning on the discharge circuit.

[0058] When it is necessary to control the discharge circuit to be turned off, the controller 35 outputs a high-level signal to control the switch Q11 to conduct, causing the switch Q9 to turn off and the switch Q13 to conduct, pulling down the signal at the control terminal of the fourth control unit 342, accelerating the turn-off of the fourth control unit 342. After the fourth control unit 342 is turned off, the discharge circuit is turned off.

[0059] In this embodiment, the lithium battery charging circuit enhances the driving capability of the controller 35 by setting cascaded switching transistors Q11 and Q9, enhances the current carrying capacity of the circuit by setting parallel switching transistors, and further ensures the reliability of the circuit by accelerating the turn-off of the fourth control unit 342 through switching transistor Q13.

[0060] In one embodiment, based on the above embodiments, Figure 8 The diagram shows a circuit diagram of a power supply module 31. The power supply module 31 includes a DC-DC converter U1 and a voltage regulator U2. The input terminal of the DC-DC converter U1 is connected to the positive terminal of the lithium battery 10. The input terminal of the DC-DC converter U1 is used to input a first power signal. The output terminal of the DC-DC converter U1 is used to output a second power signal. The input terminal of the voltage regulator U2 is used to input the second power signal. The voltage regulator U2 is used to regulate the voltage of the second power signal.

[0061] Understandably, the first power signal is either an external power source signal or a signal from the lithium battery 10. The DC-DC converter U1 is used to convert the signal from the external power source or the signal from the lithium battery 10. The second power signal is a 12V signal. The voltage regulator U2 regulates the 12V signal to obtain a 3.3V voltage to power the controller 35.

[0062] The lithium battery charging circuit of this embodiment converts the external power signal or the signal from the lithium battery 10 by setting a DC-DC converter U1, and sets a voltage regulator U2 to regulate the battery voltage. The regulated signal is used to power the controller 35, providing stable operating conditions for the circuit, protecting the circuit, and greatly improving the stability of the circuit.

[0063] This application also provides a lithium battery charging device 30, which, exemplary, includes the aforementioned lithium battery charging circuit. Exemplarily, the charging device 30 is a two-wheeled vehicle charger. Through the charging circuit in the charging device 30, miniaturization, portability, and high efficiency of the charging equipment are achieved, demonstrating significant market potential.

[0064] This application also provides a charging system, which, exemplary, includes a lithium battery and a charging device 30 for the lithium battery, wherein, exemplary, the charging device 30 is a two-wheeled vehicle charger and the lithium battery 10 is a two-wheeled vehicle lithium battery.

[0065] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that, in alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0066] In addition, the functional modules or units in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0067] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a smartphone, personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0068] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A charging circuit for a lithium battery, characterized by, include: Power supply module, discharge load, power supply control module, discharge control module, and controller; The power supply module, the lithium battery, and the power supply control module are connected in series to form a power supply circuit, and the discharge load, the lithium battery, and the discharge control module are connected in series to form a discharge circuit. The controller is communicatively connected to the lithium battery. When it receives a charging signal, the controller controls the power supply control module to turn on the power supply circuit to charge the lithium battery. When it receives a heating signal, it controls the power supply control module and the discharge control module to alternately turn on and off to output a pulse signal to the lithium battery, thereby raising the temperature of the lithium battery.

2. The charging circuit for a lithium battery according to claim 1, wherein The power supply control module includes: a first control unit and a second control unit. The input terminal of the first control unit is connected to the output terminal of the power supply module, and the output terminal of the first control unit is connected to the control terminal of the second control unit. The control terminal of the first control unit is electrically connected to the controller. The input terminal of the second control unit is connected to the negative terminal of the lithium battery, and the output terminal of the second control unit is connected to the negative terminal of the power supply module.

3. The charging circuit for a lithium battery according to claim 2, wherein The power supply control module further includes: a first discharge unit, the input terminal of the first discharge unit is connected to the control terminal of the second control unit, the output terminal of the first discharge unit is connected to the negative terminal of the power supply module, and the control terminal of the first discharge unit is connected to the output terminal of the first control unit.

4. The charging circuit for a lithium battery according to claim 1, wherein The discharge control module includes a third control unit and a fourth control unit. The input terminal of the third control unit is connected to the output terminal of the power supply module. The first output terminal of the third control unit is connected to the control terminal of the fourth control unit. The control terminal of the third control unit is electrically connected to the controller. The input terminal of the fourth control unit is connected to the negative terminal of the lithium battery. The output terminal of the fourth control unit is connected to the negative terminal of the discharge load.

5. The charging circuit for a lithium battery according to claim 4, wherein The discharge control module further includes: a second discharge unit, the input terminal of which is connected to the control terminal of the fourth control unit, the output terminal of which is connected to the negative terminal of the lithium battery, and the control terminal of which is connected to the second output terminal of the third control unit.

6. The charging circuit for a lithium battery of claim 2, wherein, The second control unit includes four switching transistors connected in parallel.

7. The charging circuit for a lithium battery of claim 1, wherein, The power supply module includes a DC-DC converter and a voltage regulator. The input terminal of the DC-DC converter is connected to the positive terminal of the lithium battery. The input terminal of the DC-DC converter is used to input a first power signal, and the output terminal of the DC-DC converter is used to output a second power signal. The input terminal of the voltage regulator is used to input the second power signal, and the voltage regulator is used to regulate the voltage of the second power signal.

8. A charging device for a lithium battery, characterized in that The lithium battery charging device includes the lithium battery charging circuit according to any one of claims 1-7.

9. A charging system, characterized by The charging system includes a lithium battery and a charging device for the lithium battery as described in claim 8.

10. The charging system of claim 9, wherein, The charging device is a two-wheeled vehicle charger, and the lithium battery is a two-wheeled vehicle lithium battery.

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